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22 July 2013, 16:29
The US songwriter says the song was a "hard one to give up" to Katy for her 2010 album.
Katy Perry almost didn't get to record and release one of her most famous songs, 'Teenage Dream', as songwriter Bonnie McKee says she strongly considered keeping the track for herself.
The 'American Girl' singer, who has co-written some of Katy's biggest hits alongside the 'Firework' star, says 'Teenage Dream' was very personal to her and was a difficult song to "give up".
"I loved 'Teenage Dream'," Bonnie told US radio station 92.3 Now this week. "I think that was my favourite one.
"That was a hard one for me to give up because I've had that teenage theme kind of throughout my music," she explained, before admitting that it might not have been a hit without Katy's interpretation of the song.
The US songwriter has written hits for the likes of Rita Ora, Carly Rae Jepsen and Britney Spears in recent years, as well as Katy Perry's huge singles 'Wide Awake, 'Part Of Me', 'Last Friday Night (T.G.I.F.)' and 'California Gurls'.
Check out a picture of Katy Perry at a red carpet event recently below (Credit: Getty):
Bonnie McKee has recently struck out on her own after releasing a new song called 'American Girl', with many of her past collaborators like Katy Perry, Carly Rae Jepsen and Macklemore appearing in the single's music video.
Katy Perry is currently working on her own new album, the follow-up to 2010's 'Teenage Dream'.